The Navy repeated that tweet about 20 minutes later to confirm that the shooter was still active.

By about 9 a.m. EDT, the Navy’s Twitter account was pointing followers to a full statement about the shooter, which said employees were under a “shelter in place” order, which essentially is an order to hide in a small room, and that there was one confirmed injury. News organizations reported multiple injuries, but the Navy confirmed only one as of about 9:20 a.m. EDT, later updating that to “several” injuries.

At about 2:30 p.m. EDT, the Navy tweeted that the Washington DC Police Department confirmed 12 people died in the shootings.

The Navy’s official hashtag for the incident, #NavyYardShooting, became the hashtag Twitter users quickly adopted to talk about what was happening. News organizations and personalities were using the hashtag to offer information about road closings:

DC-Closings Due to #navyyardshooting 2nd st to 4th st, at M St SE rod SE & 11th at bridge is closed as shooter is still on the loose.